Promising X-ray fluorescent tests for superconducting tunnel junction detector

Journal Article · Thu Jan 11 00:00:00 EST 2001 · Synchrotron Radiation News

DOI:https://doi.org/10.1080/08940880108261137· OSTI ID:828121

Friedrich, Stephan; Robinson, Art

Scientists in the Physical Biosciences Division of the Ernest Orlando Berkeley National Laboratory (Berkeley Lab) studying transition metals in proteins with fluorescence-detected L-edge absorption spectroscopy have found the measurements to be extremely challenging. The difficulty is that the metal centers are present in very dilute concentrations so that their weak fluorescence is often obscured by strong background signals from carbon and oxygen. To solve this problem, the Berkeley group has been working with researchers from the Advanced Detector Group at the Lawrence Livermore National Laboratory on an energy-dispersive superconducting tunnel junction x-ray detector. These devices in principle have the energy resolution needed to reveal the metal signal. The most recent results with the latest version of the detector on Beamline 4.0.1-2 at the Advanced Light Source (ALS) illustrate the promise of the cryogenic detector strategy not only for this application but also for spectroscopy of other types of dilute samples.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Basic Energy Sciences (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 828121
• Report Number(s): LBNL-47868; R&D Project: 458090; TRN: US0403842
• Journal Information: Synchrotron Radiation News, Vol. 14, Issue 2; Other Information: Journal Publication Date: March/April 2001; PBD: 11 Jan 2001
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
47 OTHER INSTRUMENTATION
ABSORPTION SPECTROSCOPY
ADVANCED LIGHT SOURCE
CARBON
CRYOGENICS
ENERGY RESOLUTION
FLUORESCENCE
JUNCTION DETECTORS
LAWRENCE LIVERMORE NATIONAL LABORATORY
OXYGEN
PROTEINS
SPECTROSCOPY
TRANSITION ELEMENTS
SUPERCONDUCTIVITY
X-RAY DETECTION
SUPERCONDUCTIVITY X-RAY DETECTOR SUPERCONDUCTING TUNNEL JUNCTION DETECTOR